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By: Neves, C. A. - Brito-Gitirana, Lycia de - Serrão, J. E.Type: ArticleIn: Instituto Internacional de EcologiaVolume:Series:Issue:Date: 2003-11-01Page Range:Publication Info: Instituto Internacional de Ecologia 2003-11-01Subjects: endocrine cells insect midgut secretory granules stingless bee ultrastructure